For the ''trouble'' Requirement (or folder) what do you have when you look on the ''test coverage'' tab (when you open the requirement in a ''form'')?
If the test coverage table/list is empty, you will get ''Not Covered'' instead of a test status.

In the Requirement module, everything is a ''requirement'', they are designated with different ''Requirement Types'' like Folder, Group, Functional Requirement, and Testing Requirement.

Also, each Requirement type has a ''Test Coverage'' (does it participate in test coverage) checkbox. Folders, for example do NOT participate.

Each requirement has it's OWN coverage, and coverage does not ''roll-up'' to the parent object.